if (window.applicationCache) {

var appCacheStatuses = [

'uncached',

'idle',

'checking',

'downloading',

'updateready',

'obsolete'

];

var updatingAppcache = false;

var reloadRetry = null;

var appcacheUpdated = false;

Reload._onMigrate('appcache', function (retry) {

if (appcacheUpdated)

return [true];

// An uncached application (one that does not have a manifest) cannot

// be updated.

if (window.applicationCache.status === window.applicationCache.UNCACHED)

return [true];

if (!updatingAppcache) {

try {

window.applicationCache.update();

} catch (e) {

Meteor._debug('applicationCache update error', e);

// There's no point in delaying the reload if we can't update the cache.

return [true];

}

updatingAppcache = true;

}

// Delay migration until the app cache has been updated.

reloadRetry = retry;

return false;

});

// If we're migrating and the app cache is now up to date, signal that

// we're now ready to migrate.

var cacheIsNowUpToDate = function () {

if (!updatingAppcache)

return;

appcacheUpdated = true;

reloadRetry();

};

window.applicationCache.addEventListener('updateready', cacheIsNowUpToDate, false);

window.applicationCache.addEventListener('noupdate', cacheIsNowUpToDate, false);

// We'll get the obsolete event on a 404 fetching the app.manifest:

// we had previously been running with an app cache, but the app

// cache has now been disabled or the appcache package removed.

// Reload to get the new non-cached code.

window.applicationCache.addEventListener('obsolete', (function () {

if (reloadRetry) {

cacheIsNowUpToDate();

} else {

appcacheUpdated = true;

Reload._reload();

}

}), false);

} // if window.applicationCache